Thousands of Walmart workers have joined the independent group, which has won some minor victories since it was formed in 2011. The group has called for more steady scheduling and minimum annual income of $25,000 for full-time sales associates.

The UFCW has tried that already. It even won organizing votes in a Texas Walmart’s meatpacking unit and in a Quebec store. But the victories were short-lived. Walmart outsourced the company’s meatpacking and shut down the Quebec store, according to news reports at the time.